package com.kaoqin.util;


import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;


public class ImportExcelUtil {
	
	private final static String excel2003L =".xls";    //2003- 版本的excel
	private final static String excel2007U =".xlsx";   //2007+ 版本的excel
	
	/**
	 * 描述：获取IO流中的数据，组装成List<List<Object>>对象
	 * @param in,fileName
	 * @return
	 * @throws IOException 
	 */
	public  List<List<Object>> getBankListByExcel(InputStream in,String fileName) throws Exception{
		List<List<Object>> list = null;
		
		//创建Excel工作薄
		Workbook work = this.getWorkbook(in,fileName);
		if(null == work){
			throw new Exception("创建Excel工作薄为空！");
		}
		Sheet sheet = null;
		list = new ArrayList<List<Object>>();
        sheet =  work.getSheetAt(0);
        for (int j = 0; j < sheet.getLastRowNum() + 1; j++) {// getLastRowNum
            Row row = sheet.getRow(j);
            if (row != null) {
            	List<Object> li = new ArrayList<Object>();
                for (int k = 0; k < row.getLastCellNum(); k++) {// getLastCellNum
                	Cell cell = row.getCell(k);
                    if (cell != null) { // getCell 获取单元格数据
                        li.add(this.getCellValue(cell));
                    }
                }
                list.add(li);
            }
        }
		return list;
	}
	
	/**
	 * 描述：根据文件后缀，自适应上传文件的版本 
	 * @param inStr,fileName
	 * @return
	 * @throws Exception
	 */
	public  Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{
		Workbook wb = null;
		String fileType = fileName.substring(fileName.lastIndexOf("."));
		if(excel2003L.equals(fileType)){
			wb = new HSSFWorkbook(inStr);  //2003-
		}else if(excel2007U.equals(fileType)){
			wb = new XSSFWorkbook(inStr);  //2007+
		}else{
			throw new Exception("解析的文件格式有误！");
		}
		return wb;
	}

	/**
	 * 描述：对表格中数值进行格式化
	 * @param cell
	 * @return
	 */
	public  Object getCellValue(Cell cell){
		Object value = null;
		DecimalFormat df = new DecimalFormat("0");  //格式化number String字符
		SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");  //日期格式化
		DecimalFormat df2 = new DecimalFormat("0.00");  //格式化数字
		
		switch (cell.getCellType()) {
		case Cell.CELL_TYPE_STRING:
			value = cell.getRichStringCellValue().getString();
			break;
		case Cell.CELL_TYPE_NUMERIC:
			if("General".equals(cell.getCellStyle().getDataFormatString())){
				value = df.format(cell.getNumericCellValue());
			}else if("m/d/yy".equals(cell.getCellStyle().getDataFormatString())){
				value = sdf.format(cell.getDateCellValue());
			}else{
				value = df2.format(cell.getNumericCellValue());
			}
			break;
		case Cell.CELL_TYPE_BOOLEAN:
			value = cell.getBooleanCellValue();
			break;
		case Cell.CELL_TYPE_BLANK:
			value = "";
			break;
		default:
			break;
		}
		return value;
	}
	

}